APPLICATION NOTES FOR MIL-C-27500

1. Cable may be used in Level 1, 2 or 3 applications.
2. The cable types listed in the NPSL use AS22759 for the individual wires.  Refer to the Application Notes for AS22759 wire.
3. Preferred Construction:  Preferred base wire types include M22759/11 (symbol RC) and M22759/44 (symbol SR). Preferred shield types are silver coated copper round (symbol S) or flat (symbol G).  Preferred jacket types include PTFE teflon (symbol 06), FEP teflon (symbol 09) or crosslinked ETFE (symbol 23).
4. The designation shown for braid coverage includes preferred conductor identification method (white base color with color spiral stripe).  Optional solid identification color coding is available.
5. Single conductor cable must be shielded and/or jacketed.  Otherwise, for single conductors use one of the basic wire types listed in the section for AS22759.
6. The double jacket symbol shall only be used in conjunction with a double shield symbol.  The first jacket appears between the two shields and the second jacket over the outer shield.  Both jackets are the same material.
7. The shield and jacket types listed herein are preferred as first selection choice.  However, other shield and jacket options (not listed herein) are available.  Consult MIL-C-27500.
8. Not all AS22759 wire detail specifications offer the entire wire size range listed.  Consult the NPSL section for AS22759 for further details.
9. CAUTION!!! Some fluoropolymer insulation materials such as Ethylene-Tetrafluoroethylene (ETFE) may outgas trace amounts of fluorine over time. NASA GSFC Advisory NA-GSFC-2003-03 (Dec. 2002) addresses corrosion concerns for metal shell connectors (especially microminiature and nanominiature types) and contacts that are terminated with fluoropolymer insulated wire AND stored in sealed plastic/metal bags for several months or longer. In sealed packages, Fluorine that is outgassed may react with moisture to form highly corrosive hydrofluoric acid. This acid is capable of corroding metals such as Nickel and Gold which are commonly used finishes for spaceflight connectors and contacts.

As a precaution for all flight hardware with pre-wired connector assemblies, the following mitigations are recommended by NA-GSFC-2003-03:

• Projects should inspect the connectors upon receipt (both the shell and contacts) using appropriate magnification to
  verify that there is no corrosion. The existing inventory of pre-wired connector assemblies should be reinspected. In
  addition, all assemblies should be inspected before use. Inspect for darkening of the shiny metal surfaces. All
  connector interfaces should be covered with protective dust covers. For assemblies that have already been integrated
  into flight hardware and that were inspected and found to be acceptable before mating, there should be no concern for
  subsequent malfunction.
• The pre-wired connector assemblies should be removed from sealed bags and stored in open packages that will allow
  any reactive fluorine compound (s) to escape. Connector assemblies should be stored in a controlled humidity
  environment. The preferable storage area for pre-wired connector assemblies would be in a dry nitrogen atmosphere.